Cognitive impairment, with lower IQ among those who were frequent users in adolescence.

Symptoms of chronic bronchitis.

Poor education outcome, with increased likelihood of dropping out of school.

Cannabis withdrawal symptoms

Anxiety

Irritability

Sleeping difficulties

Craving for the drug

Cannabis is also listed as a Schedule I drug in the 1961 Single Convention on Narcotic Drugs. The 1961 Single Convention on Narcotic Drugs is an international agreement to control the cultivation of opium poppy, coca bush, cannabis plant, and their products which are referred to as "narcotic drugs". Singapore is one of the 184 signatories to the Convention. Together with the other signatories, we are committed to prevent the misuse and illicit trafficking of these drugs, which include cannabis.

Penalties

Cannabis is classified as a Class A drug under the Misuse of Drugs Act.

Possession or consumption of cannabis:

Up to 10 years of imprisonment or S$20,000 fine or BOTH

Illegal traffic, import or export of:

Cannabis of more than 500 grams > May face the death penalty

Cannabis resin of more than 200 grams > May face the death penalty

Cannabis mixture of more than 1,000 grams > May face the death penalty

[1] “Adverse Health Effects of Marijuana Use”, The New England Journal of Medicine, 5 June 2014 National Institute on Drug Abuse